When I launch Tapatalk, select "Explore," and enter "BMW MOA," I'm taken to a screen that says "BMW MOA" and displays the old BMW blue-and-green North America logo; it has spaces for username and password. I enter mine, but it doesn't let me in.
If I go to "History," there's an entry showing "BMW MOA guest." Below that is a tab for "Forums," which takes me to the forums as a guest. I can see things as a guest, but it's clumsy as there doesn't appear to be a "new posts" setting, and I can't post as I'm still not logged in.
Perhaps this is not yet a mature technology.